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A list of the error codes most frequently returned by web servers. The most common error codes are in bold.
Error Code |
Explanation |
| 000 | Incomplete/Undefined error |
| 201 | Created |
| 202 | Accepted |
| 203 | Partial Information |
| 204 | Page does not contain any information |
| 204 | No response |
| 206 | Only partial content delivered. The requested file was not completely downloaded to the client. This can indicate a slow server. |
| 300 | Page redirected |
| 301 | Permanent URL relocation. Temporary URL relocation. This error can occur, for example, if a URL like domain.com is typed into the browser; the server will relocate the page to domain.com/index.html. Some servers return a 302 code. |
| 302 | Temporary URL relocation. Temporary URL relocation. This error can occur, for example, if a URL like domain.com is typed into the browser; the server will relocate the page to domain.com/index.html. Some servers return a 301 error. |
| 303 | Temporary relocation method and URL |
| 304 | Document not modified. This error is returned if a document is not requested by a the browser (most likely because it has been cached) |
| 400 | Bad request (syntax) |
| 401 | Unauthorized access (requires authentication) |
| 402 | Access forbidden (payment required) |
| 403 | Forbidden |
| 404 | URL not found. These errors point to missing pages. |
| 405 | Method not Allowed. Most likely the result of a corrupt CGI script. |
| 408 | Request time-out; may indicate a slow server |
| 500 | Internet server error |
| 501 | Functionality not implemented |
| 502 | Bad gateway |
| 503 | Service unavailable |
Adobe Acrobat, PDF, and Incomplete Transfers: Note that we have noticed that Adobe Acrobat may read PDF files from your server many times for a single document access, and as a result PDF files may show a huge number of incomplete transfers and hits for each individual request for a PDF file on your website.